840 



ARBORETUM ET FRUTICETUM BRITANNICUM. 



from moisture in the soil during winter, the alleys between the beds may be 

 deepened, so as to act as drains. In the nursery lines, the plants require 

 very little pruning, and their after-care, wlien in plantations, is equally simple. 



34 5? 2. B.(y A.) DAu^RiCA Pall. The Daurian Birch. 



Identification. Pall. Ross., 1. p. 60. ; Willd. Sp. PI., 4. p. 463. ; N. Du 



Ham., 3 p. 204. 

 Synimynies. B. excelsa canadensis Wang. Beitr. p. 86. ; Bouleau tie 



.Siberie, Fr. 

 Engravings. Pall. Ross., 1. t. 39. ; Willd. Baum., t. 1. f. 3. and 4. ; and 



ouryf^. 1529. 



Sjiec. Char.y Sfc. Leaves ovate, narrow at the base, 

 quite entire, unequally dentate, glabrous. Scales of 

 the strobiles ciliated on their margins ; side lobes 

 roundish. {Willd.) A deciduous tree. Dauria, and, 

 part of Asiatic Siberia ; but not in European Siberia, 

 nor in Russia. Height 20 ft. to 30 ft. Introduced 

 1796. Catkins whitish brown, larger than those of the 

 common birch ; February and March. Fruit brown; 

 ripe September. Decaying leaves red or yellow. 



Variety. 



St !if B. (? A.) d. 2 2}arvifdlia Hayne Dend. p. 167. 

 1529. B.da(irica. Leaves Smaller than thosc of the species. 



^ 3. J?.(? J.)FRUTico^SA Pall. The shrubby Birch. 



Identification. Pall. Ross., 1 . p. 62. ; Willd. Sp. PI., 4. p. 466. ; N. 



Du Ham., 3. p. 208. 

 Synonymes. B. hilmilis Schrank Sal. p. 56. ; B. quebecci^ns^s 



Sclirank der Gesells.Xaturf. Freunde, 5. p. 196. 

 Engravijigs. Pall. Ross., 1. t. 40. ; Dend. Brit., t. 151.; and our 



fig- 1530. 



Spec. Char., Sfc. Leaves roundish-ovate, nearly 

 equally serrate, glabrous. Female catkins oblong. 

 {Willd.') A deciduous shrub. Eastern Siberia, 

 Germany, and Canada. Height 5 ft. to 6 ft. in' 

 moist situations, but much higher on mountains. 

 Introduced in 1818. Catkins whitish brown ; 

 February and March. Fruit brown j ripe in 

 October or November. 



1530. B. fhiticosa. 



ji 4. B. (? A.) pu^MiLA L. The hairy dwarf Birch. 



Identification. Willd. Sp. PI., 4. p. 467. ; Pursh Fl. Ampr. Sept., 2. p. 622. ; N. Du Ham., 3. p. 207. 



Synonytne. B. nana Kalm Itin. 2. p. 263. 



Engravings. Jacq. Hort. Vind., t. 122. ; Dend. Brit., t. 97. ; and our^g. 1531. 



Spec. Char., S^c. Branches pu- 

 bescent, without dots. Leaves 



roundish ovate, on long foot- 

 stalks, densely clothed with 



hairs on the under surface. 



Female catkins cylindrical. 



(Willd.) A deciduous shrub. 



Canada, in bogs, and on high 



mountains in New York and 



Pennsylvania. Height 2 ft. 



to 3 ft. Introduced "in 1762. 



Catkins whitish ; May and 



June. Fruit brown. 



The root is red, and is used 

 for veneering and inlaying. 





S 3. B. NA^NA L. 



1531. B. (?^.)pi>mUa. 



The dwarf Bircn. 



Identification. Lin. Sp. PI., 1391. ; Eng. Fl., 4. p. 154. Pursh Fl. Amer. Sept., 2. p. 262. 



